Also George Graham, a husbandman; he died soon after the birth of our George, who was reared by a brother.

No information on financial status.

3. Nationality

Birth: English

Career: English

Death: English

4. Education

Schooling: No University

No university education.

Apprenticed to Henry Aske, a clockmaker in London, 1688- 1695.

5. Religion

Affiliation: Anglican

Graham's father was a Quaker, but he was reared by a brother who was not. Although himself conducted his own life in what I might call a Quaker manner, several aspects of it (such as his willingness to take an oath, and his burial in Westminster Abbey) indicate that he was not a Quaker.

6. Scientific Disciplines

Primary: Instrumentation

Subordinate: Astronomy, Physics

Graham is known as the preeminent instrument maker of his time, a man of major importance in the development of chronometry.

He was also very knowledeable in astronomy, as he needed to be in order to perfect astronomical instruments. He made observations and published them in the Philosophical Transactions.

Graham was actively involved, intellectually as well as professionally as an instrument maker, in establishing the exact shape of the earth by means of precision clocks. With his measurements (I include measurements in the tropics made with his instruments and instructions) he corrected Newton's figures for the proportional of the earth's axes.

Thomas Tompion treated him with utmost kindness as a virtual member of the family, and he eventually succeeded to Tompion's business as his heir. After waffling for some time, I have decided to include this. Since I have not used the category of Artisan under patronage, I will list this under Merchant.

Graham somewhat repeated his own experience with Tompion by giving, in his turn, every encouragement and support to Harrison.

With Tompion he made an "orrery," the original one from which the name comes, for the Earl of Orrery.

9. Technological Involvement

Type: Instruments

Orrery, with Tompion. Sorrenson says that Graham invented the orrery, but others deny that this one was even the first, though it was one of the first.

Deadbeat escapement, about 1715.

Mercury compensated pendulum, 1722.

The cylinder escapement for watches, 1725.

8-foot quadrant with vernier, attaining a new level of accuracy, for Halley.

24 1/4-foot zenith sector with a micrometer screw. He later made a 12 1/2 foot instrument of the same sort for Bradley, with which he discovered the aberration of light.

The apparatus used by the French for the measurement of a degree of the meridian in the far north.

Improved micrometer screw for a reflecting telescope, 1727.

He invented a beam caliper with a micrometer screw.

10. Scientific Societies

Membership: Royal Society

Informal Connections: He made an Orrery for Earl of Orrery, a great quadrant for Halley, a transit instrument and a great zenith sector for the Royal Observatary, and the apparatus used for the measurement of a degree of the meridian for Académie des Science of France.

Royal Society, 1721-51. Council 1722.

Prominent also in the Clockmakers' Company; Master in 1722.

Sources

Dictionary of National Biography (repr., London: Oxford University Press, 1949-50), 8, 314-15. J. Bradley, "An Account of Some Observations Made in London, by Mr.